JP4800206B2 - Throttle system and sensor unit - Google Patents

Description

  The present invention relates to a sensor unit incorporating a sensor (in particular, an intake pressure sensor for detecting intake pressure to the internal combustion engine) that detects various data essential for fuel supply control and intake flow rate control of the internal combustion engine, and the sensor unit. It is related with the throttle system provided with.

  2. Description of the Related Art In recent years, it has become common for internal combustion engines (hereinafter referred to as “engines” as appropriate) of automobiles including motorcycles to be controlled by an electronic control device of an engine equipped with a computer.

  In an electronic control device for an engine, various sensors that constantly detect the operating state and intake state of the engine are arranged in the engine or its peripheral devices, and an ECU (Electronic Control Unit) that centrally controls the engine electronically The engine is optimally controlled based on various data sent from various sensors.

  The engine generates rotational torque by burning an air-mixed fuel obtained by mixing a fuel such as gasoline with air in a piston. Therefore, it is important to optimize not only the fuel supply amount control to the engine but also the intake air flow rate control.

  Generally, the intake flow rate supplied to the engine is adjusted by a throttle device provided on the intake pipe side connected to the engine. This throttle device is usually provided with a throttle valve (throttle valve) inside the intake cylindrical tube, and the air flow rate is adjusted by adjusting the opening of the throttle valve.

  Therefore, the ECU must always accurately detect the opening degree of the throttle valve in the intake throttle device. The ECU detects the opening of the throttle valve based on an output signal from a throttle position sensor (hereinafter referred to as “TPS” where appropriate) installed in the vicinity of the throttle valve.

  In order to operate the internal combustion engine optimally, the ECU needs to detect not only the opening degree of the throttle valve but also the pressure of air sucked through the intake pipe. In general, the detection of the intake pressure is performed by an intake pressure sensor that is directly installed on the intake pipe or installed on a separate pipe that leads to the intake pipe (for example, Patent Document 1). reference.). Here, when the pressure of the air sucked through the intake pipe is detected by the intake pressure sensor, it is necessary to guide the air in the intake pipe to the intake pressure sensor.

Japanese National Patent Publication No. 10-512032

  However, in the above prior art, when the air in the intake pipe is led to the intake pressure sensor, if foreign matter flowing in the intake pipe flows to the intake pressure sensor together with the air, the detection accuracy by the intake pressure sensor It is possible that the situation will worsen. In particular, when gasified fuel components enter the intake pipe and the fuel components generate moisture due to condensation or the like, such moisture flows to the intake pressure sensor, which adversely affects pressure measurement by the pressure sensor. It can happen.

  The present invention has been made paying attention to such a current situation, the purpose of which can prevent foreign matter from flowing to the intake pressure sensor when guiding the air in the intake pipe to the intake pressure sensor, Accordingly, it is an object of the present invention to provide a sensor unit that can improve the detection accuracy of the intake pressure sensor and a throttle system including the sensor unit.

In order to solve the above-mentioned problems and achieve the object, a throttle system according to the present invention is attached to a throttle device for adjusting an intake air flow rate provided in an intake pipe connected to an internal combustion engine, and the throttle device. A throttle system comprising a sensor unit, wherein the sensor unit is attached to the throttle device and includes a casing constituting the sensor unit, and the casing is provided in the casing and detects intake pressure through the intake pipe. A pressure sensor chamber that houses and holds an intake pressure sensor for receiving the pressure, the pressure sensor chamber receiving a pressure in the intake pipe, and a pressure detection region for detecting the pressure received by the pressure receiving region by the intake pressure sensor If, have a, a partition wall for partitioning the pressure receiving region and the pressure detection region, the pressure detection and the pressure receiving area A communication portion that communicates with a region, and both the pressure receiving region and the pressure detection region are formed at a position that directly faces the throttle device of the sensor unit, and the communication portion connects the sensor unit to the throttle device. It is defined by the partition, the housing, and the throttle device .
In the throttle system according to the present invention, the pressure receiving region communicates with the intake pipe through at least two pressure sampling passages. The pressure sampling passage is provided in the throttle device, and An upstream passage portion located upstream of the intake pipe in the intake direction and a downstream passage portion located downstream of the intake pipe in the intake direction are characterized.

In the throttle system according to the present invention as set forth in the invention described above, a water reservoir for storing water generated in the pressure receiving area is formed in the pressure receiving area at a position directly facing the throttle device of the sensor unit . It is characterized by that.

In the throttle system according to the present invention, the partition wall is formed in a concave shape toward the pressure receiving region side, and the water reservoir is formed by the partition wall.

  Moreover, the throttle system according to the present invention is characterized in that, in the above invention, the communication portion is configured to have a size capable of regulating pulsation of fluid passing through the communication portion.

Further, a throttle system according to the present invention, in the invention, the pressure receiving area, opening of the pressure sampling passage and having a pressure receiving part opposed.

  The throttle system according to the present invention is characterized in that, in the above invention, the upstream-side passage portion and the downstream-side passage portion are arranged non-parallel to each other.

  The throttle system according to the present invention is characterized in that, in the above invention, an inner diameter of the upstream passage portion is set smaller than an inner diameter of the downstream passage portion.

The sensor unit according to the present invention is a sensor unit that is attached to a throttle device for adjusting an intake air flow rate provided in an intake pipe connected to an internal combustion engine, and constitutes the sensor unit that is attached to the throttle device. A housing, and a pressure sensor chamber that is provided in the housing and houses and holds an intake pressure sensor for detecting an intake pressure through the intake pipe, and the pressure sensor chamber receives pressure in the intake pipe. a pressure receiving area, said to have a, a pressure detecting area to detect the pressure receiving area is received by the intake pressure sensor, a partition wall for partitioning the pressure receiving region and the pressure detection region, the pressure detection region and the pressure receiving area The pressure receiving area and the pressure detection area are both directly connected to the throttle device of the sensor unit. Is formed at a position, the communication unit may be defined by said casing by attaching the throttle device and the partition wall and the housing and the throttle device.

  According to the throttle system and sensor unit of the present invention, it is possible to prevent foreign matter from flowing to the intake pressure sensor when air in the intake pipe is guided to the intake pressure sensor, thereby improving the detection accuracy of the intake pressure sensor. it can.

FIG. 1 is a cross-sectional view of a throttle system according to an embodiment of the present invention. FIG. 2 is a plan view of the sensor unit viewed from the direction A in FIG. FIG. 3 is a plan view of the sensor unit viewed from the direction B in FIG. FIG. 4A is a partial plan view of the pressure sensor chamber showing a state in which the pressure detection region is positioned on the lower side and the pressure receiving region is positioned on the upper side. FIG. 4B is a partial plan view of the pressure sensor chamber showing a state in which the pressure detection region is positioned on the upper side and the pressure receiving region is positioned on the lower side. FIG. 5 is a view in the direction of arrow C in FIG. 6 is a cross-sectional view taken along the line DD of FIG.

Explanation of symbols

S Throttle system 1 Sensor unit 2 Throttle device 13a Pressure sampling passage (upstream passage)
13b Pressure sampling passage (downstream passage)
21 Unit body (housing)
26 Pressure sensor chamber 32 Intake pressure sensor 70 Pressure receiving area 72 Pressure detecting area 73, 75 Pressure receiving part 80 Partition wall 93 Water reservoir part 95a First crank path part 95b Second crank path part s Gap (communication part)

  Embodiments of a throttle system and a sensor unit according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. The throttle system and sensor unit according to the present invention can be used, for example, in an automobile (motorcycle).

  FIG. 1 shows a throttle system S including a sensor unit 1 and a throttle device 2 according to an embodiment of the present invention. FIG. 2 is a plan view of the sensor unit 1 viewed from the direction A in FIG. FIG. 3 is a plan view of the sensor unit 1 viewed from the direction B in FIG. 2 and 3 show the sensor unit 1 according to the present embodiment detached from the throttle device 2.

  As shown in FIG. 1, the sensor unit 1 is attached to the side surface of the throttle body 20 in the vicinity of the throttle shaft 15 in the throttle device 2. In FIG. 1, the left side of the throttle shaft 15 indicates the intake upstream side (air filter side), and the right side of the throttle shaft 15 indicates the intake downstream side (engine side).

  The throttle body 20 is formed in a cylindrical shape and is provided in an intake pipe (not shown) connected to the internal combustion engine. An air horn 10A is formed at the left end of the throttle body 20, and a flange 10B is formed at the right end. The outside air taken in from the air intake is filtered by an air filter (not shown), and the filtered air is supplied to the throttle device 2 from the air horn 10A side.

  The throttle device 2 controls the intake air flow rate to the engine by narrowing or widening the passage area of the filtered air, that is, the opening of the throttle valve 18. Specifically, a throttle shaft 15 is provided substantially at the center of the side surface of the throttle body 20, and a throttle valve 18 that adjusts the intake air flow rate is coupled to the throttle shaft 15. The throttle device 2 adjusts the opening degree of the throttle valve 18 by rotating the throttle shaft 15. As will be described later, the opening degree of the throttle valve 18 is detected by, for example, a non-contact position sensor (TPS) 50 including a hall element 31.

  As shown in FIG. 1, an intake air temperature sensor 33 that detects the temperature of air sucked through the intake pipe is disposed on the intake upstream side of the throttle valve 18, and the intake pipe is provided on the downstream side of the throttle valve 18 through the intake pipe. An intake pressure sensor 32 that detects the pressure of the sucked air is disposed. Further, between the intake air temperature sensor 33 and the intake pressure sensor 32, the above-described TPS 50 that detects the opening degree of the throttle valve 18 is disposed. Here, the TPS 50, the intake pressure sensor 32, and the intake temperature sensor 33 are respectively in a position sensor chamber 23, a pressure sensor chamber 26, and a temperature sensor chamber 24 provided at predetermined positions of the unit body (housing) 21 of the sensor unit 1. Is stored and held in a predetermined space portion. In this embodiment, the space portion of the pressure sensor chamber 26 that accommodates and holds the intake pressure sensor 32 is formed by a rectangular frame-shaped peripheral wall 26b (shown clearly in FIG. 2).

  The unit main body (housing) 21 is formed by pouring a molding material into a mold having a predetermined shape as will be described later. The unit body 21 has a predetermined thickness H and is attached to the throttle body 20 of the throttle device 2 in the thickness direction. When the unit main body 21 is attached to the throttle body 20, the sensors 32, 33, 50 are automatically positioned at predetermined measurement positions in the throttle device 2. Specifically, a substantially cylindrical fitting portion 60 is formed in the throttle body 20, and a substantially cylindrical peripheral wall portion 59 that forms the position sensor chamber 23 is fitted in the fitting portion 60. It is like that.

  The temperature sensor chamber 24 is formed by a conduit 24 a that protrudes from the unit body 21 with a length that reaches the inner wall of the throttle body 20 of the throttle device 2, and this conduit 24 a is fitted into a through hole 20 a provided in the throttle body 20. It is supposed to be inserted. The substantially cylindrical peripheral wall portion 59 of the position sensor chamber 23 and the conduit 24a of the temperature sensor chamber 24 are respectively inserted into the fitting portion 60 and the through hole 20a of the throttle body 20, whereby the unit main body 21 is moved around the throttle shaft 15. While being positioned with respect to the throttle device 2, the sensors 32, 33, 50 are automatically positioned at predetermined measurement positions in the throttle device 2. That is, the intake temperature sensor 33 is disposed at a predetermined position on the upstream side of the intake of the throttle valve 18, the intake pressure sensor 32 is disposed at a predetermined position on the downstream side of the intake of the throttle valve 18, and the TPS 50 is positioned at a predetermined valve detection position described later. Positioned. The unit main body 21 is provided with screw holes 14 into which screws for fixing the unit main body 21 to the throttle body 20 are screwed in two places with the TPS 50 interposed therebetween (see FIGS. 2 and 3). .

  In the present embodiment, the position sensor chamber 23 and the pressure sensor chamber 26 have openings 23a and 26a that open in opposite directions in the thickness H direction of the unit body 21, respectively. Although not shown, the opening 26 a of the pressure sensor chamber 26 is closed by a cover (not shown), whereby the intake pressure sensor 32 is accommodated in the pressure sensor chamber 26 in a sealed state. An electrical line L connected to the TPS 50 and the intake pressure sensor 32 is disposed between the position sensor chamber 23 and the pressure sensor chamber 26.

  As shown in FIG. 1, a circuit board 30 is fixedly provided at a predetermined location in the unit main body 21 of the sensor unit 1. A hall element 31 constituting the TPS 50 is directly attached to the circuit board 30 and an intake pressure sensor 32 is electrically connected thereto. In addition, a lead wire 34 from the intake air temperature sensor 33 provided at the distal end opening of the conduit 24 a of the temperature sensor chamber 24 is also electrically connected to the circuit board 30. These elements (sensors) 31, 32, 33 electrically connected to or mounted on the circuit board 30 are illustrated via terminals of a connector 28 (see FIGS. 2 and 3) formed on the unit main body 21. Not electrically connected to the electronic control circuit.

  The TPS 50 includes a substantially annular magnet M fixed to the rotor 11 that rotates together with the throttle shaft 15 coupled to the throttle valve 18, a Hall element 31 that detects a change in the magnetic field accompanying the rotation of the rotor 11, and a magnet M And a substantially cylindrical stator 55 which is provided substantially concentrically with the magnet M and forms a magnetic circuit to control the magnetic field around the Hall element 31.

  More specifically, the hall element 31 is disposed in a substantially cylindrical stator housing portion 62 formed in the unit main body 21. In the stator housing 62, a stator 55 made of a magnetic material formed in a predetermined shape is disposed in order to control the magnetic field around the Hall element 31. A rotor 11 constituting the TPS 50 is connected to the throttle shaft 15. The rotor 11 is fixed to the throttle shaft 15 by screws 16 and rotates integrally with the throttle shaft 15. The throttle shaft 15 passes through the throttle body 20 and crosses the approximate center of the throttle body 20. The throttle shaft 15 passing through the throttle body 20 is connected to the throttle lever 17 at the end opposite to the rotor 11.

  A throttle valve 18 is attached to the throttle shaft 15 in the flow path 40 in the throttle body 20, and the amount of intake air passing through the flow path 40 is adjusted according to the position (angle) of the throttle valve 18. That is, the rotation angle of the rotor 11 correlates with the opening degree of the throttle valve 18. Here, a return spring 19 is engaged with the throttle shaft 15 via a throttle lever 17. A magnet M is provided on a part of the inner peripheral surface of the rotor 11 along the circumferential direction. The magnet M is arranged along the outer periphery of the stator housing portion 62 when the sensor unit 1 is mounted on the throttle body 20.

  As described above, the TPS 50 can detect the position of the throttle valve 18 by detecting the change of the magnetic field caused by the rotation of the rotor 11 according to the position of the throttle valve 18 by the Hall element 31.

  As shown in FIG. 1, a pressure sampling passage 13 (13 a, 13 b) that communicates with a flow path 40 of the throttle body 20 is formed in the throttle body 20. The pressure sampling passage 13 is opened at the side surface of the throttle body 20 and forms an intake pressure measurement passage for communicating the inside of the flow path 40 of the throttle body 20 to the intake pressure sensor 32 side of the sensor unit 1. . The pressure sampling passage 13 includes an upstream passage portion 13a located upstream of the intake pipe in the intake direction, and a downstream passage portion 13b located downstream of the intake pipe in the intake direction. The upstream-side passage portion 13a and the downstream-side passage portion 13b are arranged non-parallel to each other. Moreover, the internal diameter of the upstream channel | path part 13a is set smaller than the internal diameter of the downstream channel | path part 13b.

  As shown in FIGS. 1 and 3, the pressure sensor chamber 26 is disposed in the flow path 40 of the throttle body 20 on the surface facing the throttle device 2, that is, on the surface facing the pressure sampling passage 13 ( Therefore, it has a pressure receiving region 70 for receiving the pressure in the intake pipe) and a pressure detection region 72 for detecting the pressure received by the pressure receiving region 70 by the intake pressure sensor 32. The pressure detection region 72 is provided with a bent through hole 98 communicating with the intake pressure sensor 32 installed on the surface of the pressure sensor chamber 26 located on the opposite side.

  As shown in FIG. 3, the pressure receiving region 70 and the pressure detection region 72 are partitioned from each other by a partition wall 80 having a substantially L-shaped cross section. In this case, the partition wall 80 has a recessed water reservoir 93 that accumulates moisture generated in the pressure receiving region 70 on the pressure receiving region 70 side.

  FIG. 4A is a partial plan view of the pressure sensor chamber showing a state in which the pressure detection region is positioned on the lower side and the pressure receiving region is positioned on the upper side. As shown in FIG. 4A, when the sensor unit 1 is attached to the throttle device 2 so that the pressure detection area 72 is positioned on the lower side and the pressure receiving area 70 is positioned on the upper side, The water W generated at 70 is stored in the water reservoir 93.

  FIG. 4B is a partial plan view of the pressure sensor chamber showing a state in which the pressure detection region is positioned on the upper side and the pressure receiving region is positioned on the lower side. As shown in FIG. 4B, when the sensor unit 1 is attached to the throttle device 2 so that the pressure detection area 72 is positioned on the upper side and the pressure receiving area 70 is positioned on the lower side, Moisture W generated in 70 is stored at the bottom of the pressure receiving region 70 by the action of gravity.

  Further, the pressure detection area 72 communicates with the pressure receiving area 70 through a predetermined communication portion. In the present embodiment, the pressure detection region 72 and the pressure receiving region 70 are separated from each other by a gap (communication portion) s between the wall portion 26b of the unit main body 21 forming the pressure sensor chamber 26 and the end portion 80a of the partition wall 80. Communicate. In the present embodiment, the gap s is limited to a predetermined size that can regulate the pulsation of the fluid passing therethrough.

  In the present embodiment, the pressure receiving region 70 has pressure receiving portions 73 and 75 facing the openings of the passage portions 13a and 13b of the pressure sampling passage 13, and these pressure receiving portions 73 and 75 are connected to the communication portion s. A path 95 (see FIG. 1) toward the intake pressure sensor 32 forms a crank shape. Specifically, the path 95 includes a first crank path portion 95 a that extends from the pressure receiving portions 73 and 75 to the through hole 98, and a second crank path portion 95 b that is formed by the through hole 98.

  In this embodiment, the connector 28 formed on the unit main body 21 electrically connects the intake pressure sensor 32 housed and held in the pressure sensor chamber 26 to an external element, as clearly shown in FIG. The external connection terminal 85 for protecting the external connection terminal 85 and a waterproof cover 76 that surrounds and protects the external connection terminal 85 and extends in a predetermined direction by a predetermined length.

  As shown in FIGS. 2, 5, and 6, the unit main body 21 communicates with the outside air through the connector 28 in the pressure sensor chamber 26 (a space defined by the peripheral wall 26 b where the intake pressure sensor 32 is disposed). An outside air passage 92 (92a, 92b) is formed. The outside air passage 92 communicates with the first passage 92b and extends in a straight line from the connector 28 toward the pressure sensor chamber 26 along the direction in which the connector 28 extends. It comprises a second passage 92a extending substantially orthogonal to the passage 92b. The first passage 92b opens in the connector 28, and the second passage 92a opens in the pressure sensor chamber 26 (a space defined by the peripheral wall 26b in which the sensor 32 is disposed).

  In the pressure sensor chamber 26, a plurality (three in this embodiment) of sensor connection terminals 70A, 70B, and 70C to which the intake pressure sensor 32 is electrically connected are provided. These sensor connection terminals 70A, 70B, and 70C are fixed to the terminal fixing portion 100 on the end wall of the pressure sensor chamber 26 located on the connector 28 side. Among these sensor connection terminals 70A, 70B, and 70C, for example, the sensor connection terminal that directly faces the connector 28 side (therefore, a linear first passage 92b can be formed with the connector 28 as will be described later). A second passage 92a extends through the terminal fixing portion 100 to which 70C is fixed so as to penetrate the terminal fixing portion 100. The second passage 92a extends vertically toward the opening 26a of the pressure sensor chamber 26 in a state of being close to the sensor connection terminal 70C.

  Next, with reference to FIG. 6, an example of a method for forming the outside air passage 92 in association with mold forming (casting) of the sensor unit 1 will be briefly described. For simplicity, FIG. 6 shows a state in which the mold body has already been removed and the unit main body 21 has been molded from the molding material.

  First, before pouring a molding material into a mold (not shown) having a predetermined shape for molding the unit main body 21, a sensor connection terminal is formed in a predetermined region in the mold for forming the pressure sensor chamber 26. 70A, 70B, and 70C are positioned using a jig 82 having a predetermined shape. At this time, as indicated by a two-dot chain line in FIG. 6, the outside air passage forming portion 82a extending in a substantially linear shape of the jig 82 extends across the sensor connection terminal 70C in a state of being close to the sensor connection terminal 70C. Let

  Next, the pin 80 is positioned so as to come into contact with the end portion of the outside air passage forming portion 82 a of the jig 82 in a predetermined region in the mold for forming the connector 28. In this state where the pin 80 and the jig 82 are positioned, the molding material is poured into the mold. Thereafter, when the pin 80 and the jig 82 are removed from the mold at a predetermined timing, an outside air passage 92 for communicating the inside of the pressure sensor chamber 26 with the outside air through the connector 28 is formed. The inner surface shape of the first passage 92 b corresponds to the outer shape of the pin 80, and the inner surface shape of the second passage 92 a corresponds to the outer shape of the outside air passage forming portion 82 a of the jig 82.

  As described above, in the sensor unit 1 of the present embodiment, the pressure sensor chamber 26 includes the pressure receiving region 70 that receives the pressure in the flow path 40 of the throttle body 20 (and hence the intake pipe), and the pressure that the pressure receiving region 70 receives. Is detected by the intake pressure sensor 32, and the pressure receiving area 70 and the pressure detecting area 72 are separated from each other by a partition wall 80. Therefore, the entry of foreign matter from the pressure receiving region 70 into the pressure detection region 72 is suppressed by the partition wall 80, and it is possible to prevent a situation in which the detection accuracy by the intake pressure sensor 32 is deteriorated by foreign matter. In particular, when the sensor unit 1 sucks the gasified fuel component in the intake pipe, moisture is generated in the pressure receiving region 70 due to condensation or the like. Such moisture also enters the pressure detection region 72 by the partition wall 80. This prevents the pressure measurement by the pressure sensor 32 from being adversely affected.

  In the present embodiment, it is preferable that the partition wall 80 is formed by an O-ring. If the partition wall 80 is formed of an O-ring in this manner, it is possible to more reliably prevent moisture generated in the pressure receiving region 70 from entering the pressure detection region 72 side.

  In the sensor unit 1 of the present embodiment, since the water reservoir 93 is formed on the pressure receiving region 70 side, dew condensation occurs when the sensor unit 1 sucks moisture generated in the pressure receiving region 70 (for example, gasified fuel component in the intake pipe). Water generated by the like) can be positively stored in the water reservoir 93, and water can be more effectively prevented from entering the pressure detection region 72 side. In the present embodiment, since the water reservoir 93 is formed by the partition wall 80 that partitions the pressure receiving region 70 and the pressure detection region 72, the water reservoir 93 is used effectively even in a narrow space of the sensor unit 1 by effectively using the partition wall 80. Can be formed efficiently.

  Such a moisture intrusion preventing effect that prevents moisture from entering from the pressure receiving region 70 to the pressure detecting region 72 is not affected by the mounting direction of the sensor unit 1 with respect to the throttle device 2. The moisture prevention effect is not affected not only by the mounting direction of the sensor unit 1 but also by the state (particularly tilt) of the vehicle body to which the throttle system S including the sensor unit 1 is mounted. For example, it is possible to prevent moisture W from entering the pressure detection region 72 even when the vehicle is being driven or left in an inclined state. In the case of a motorcycle, the same applies even when turning a curve or when the vehicle body is left in a fallen state.

  That is, as shown in FIG. 4B, when the sensor unit 1 is attached to the throttle device 2 so that the pressure detection region 72 is positioned on the upper side and the pressure receiving region 70 is positioned on the lower side, The moisture W generated in the pressure receiving region 70 accumulates at the bottom of the pressure receiving region 70 due to the action of gravity, and therefore does not enter the pressure detecting region 72 side from the pressure receiving region 70. On the other hand, as shown in FIG. 4A, when the sensor unit 1 is attached to the throttle device 2 so that the pressure detection region 72 is positioned on the lower side and the pressure receiving region 70 is positioned on the upper side, Moisture W generated in the pressure receiving region 70 is stored in the water reservoir 93 and is prevented from entering the pressure detection region 72 due to gravity.

  In the sensor unit 1 of the present embodiment, the pressure receiving region 70 and the pressure detecting region 72 are communicated with each other by a gap s between the wall portion 26a of the unit body 21 forming the pressure sensor chamber 26 and the end portion 80a of the partition wall 80. By restricting the size of the communication portion s, the pulsation of the fluid flowing from the pressure receiving region 70 to the pressure detection region 72 is regulated, so that efficient and effective pulsation regulation can be performed and the intake pressure sensor The measurement accuracy by 32 can be improved.

  Further, in the sensor unit 1 of this embodiment, the path 95 from the pressure receiving portions 73 and 75 to the intake pressure sensor 32 via the communication portion s has a crank shape. Therefore, the fluid from the intake pipe flows in a crank shape from the pressure receiving region 70 through the pressure detection region 72 and the through hole 98 to the intake pressure sensor 32. Therefore, the pulsation of the fluid is effectively regulated and the intake pressure sensor 32 Measurement accuracy can be improved.

  In the throttle device 2 of the present embodiment, since the pressure sampling passage 13 is formed by the two passage portions 13a and 13b that are separated in the intake direction, a differential pressure is generated between the passage portions 13a and 13b. Can do. Therefore, the foreign matter (for example, gasification) in the intake pipe sucked into the pressure receiving region 70 of the sensor unit 1 through the upstream passage portion (passage portion having a high intake pressure) 13a while sampling the pressure in the intake pipe through the pressure sampling passage 13. Fuel component) can be discharged again to the intake pipe through the downstream passage portion (passage portion having a low intake pressure) 13b. That is, the effect of scavenging (purging) foreign matter during intake pressure measurement can be improved. In this configuration, as the distance between the two passage portions 13a and 13b forming the pressure sampling passage 13 is increased, the differential pressure generated between the passage portions 13a and 13b can be increased. The effect can be enhanced.

  When the water reservoir 93 is provided in the pressure receiving region 70 and the two passage portions 13a and 13b having a pressure difference separated from each other in the intake direction are provided so as to communicate with the pressure receiving region 70 as in the present embodiment, The water accumulated in the water reservoir 93 can be effectively discharged to the intake pipe by the purge effect of the two passage portions 13a and 13b. Specifically, for example, when a negative pressure is generated at the time of starting the engine, the water accumulated in the water reservoir 93 can be sucked and discharged to the intake pipe through the downstream passage portion 13b.

  In the present embodiment, the upstream passage portion 13a and the downstream passage portion 13b are arranged non-parallel to each other, so even if the two passage portions 13a and 13b are close to each other, both A large differential pressure between the passage portions 13a and 13b can be secured. That is, if the upstream passage portion 13a and the downstream passage portion 13b are made non-parallel to each other and the opening portions of the passage portions 13a and 13b opened by the suction pipe are largely separated along the intake direction, for example, the sensor unit 1 is reduced in size. Therefore, even if the two passage portions 13a and 13b are brought close to each other, a large differential pressure between the passage portions 13a and 13b can be secured, and a good purge effect can be maintained.

  In the present embodiment, since the inner diameter of the upstream passage portion 13a is set smaller than the inner diameter of the downstream passage portion 13b, it is not necessary to ensure a large separation distance between the two passage portions 13a and 13b. The differential pressure between the two passage portions 13a and 13b can be increased.

  In the sensor unit 1 of the present embodiment, the second passage 92a of the outside air passage 92 passes through the terminal fixing portion 100 of the pressure sensor chamber 26 to which the sensor connection terminal 70C is fixed in a state of being close to the sensor connection terminal 70C. And extended. If the second passage 92a is provided at such a position, when the unit body 1 is formed by pouring a molding material into the mold as in this embodiment, the sensor connection terminals 70A, The second passage 92a can be formed by using a part of the jig 82 that holds 70B and 70C (outside air passage formation portion 82a). That is, in insert molding in which the sensor connection terminals 70A, 70B, and 70C are set in advance in a mold and a molding material is poured, the sensor connection terminal holding jig 82 is used as a second passage forming component (pin or the like). Can also be used. Therefore, it is possible to reduce the number of processes and the maintenance of the mold, thereby facilitating the molding operation and reducing the manufacturing cost.

  In addition, when the second passage 92a is formed in the state of being close to the sensor connection terminal 70C in this way, it is possible to effectively use the existing narrow wall portion in the unit main body 21 (the space is not wasted). Ultimately, the entire sensor unit can be downsized.

  According to the present embodiment, the first passage 92b extends substantially linearly from the connector 28 toward the pressure sensor chamber 26 along the extending direction of the connector 28, and opens in the connector 28, while the second passage 92b. The passage 92 a extends substantially orthogonally to the first passage 92 b and opens in the pressure sensor chamber 26. That is, since the outside air passage 92 is formed by the two passage portions 92a and 92b substantially orthogonal to each other, the passage configuration of the outside air passage 92 is simplified, and the passage is easily formed.

  Further, according to the present embodiment, the inside of the pressure sensor chamber 26 is communicated with the outside air by using the existing connector 28 that can communicate with the atmosphere. As described above, if the existing atmospheric chamber inside the connector 28 is used to communicate the pressure sensor chamber 26 with the outside air, that is, the existing space of the connector 28 is used effectively and efficiently. If the inside of the unit 26 communicates with the outside air, the space required for the outside air communication in the unit main body 21 can be minimized, and the entire sensor unit can be downsized.

  Further, according to the present embodiment, the pressure sensor chamber 26 is communicated with the outside air through the waterproof cover 76. That is, the inside of the pressure sensor chamber 26 communicates with a waterproof atmosphere chamber via the outside air passage 92. Therefore, it is possible to prevent water from entering the intake pressure sensor 32 through the outside air passage 92, and deterioration of measurement accuracy due to moisture adhering to the suction pressure sensor 32 (moisture adversely affects the pressure measurement of the intake pressure sensor 32). Can be avoided.

  Further, according to the present embodiment, the second passage 92a can be formed using the jig 82 that holds the sensor connection terminals 70A, 70B, and 70C in the mold as they are. That is, the jig 82 is inserted into the mold, and then the jig 82 is removed from the mold (normal work for holding and releasing the sensor connection terminals 70A, 70B, and 70C). At the same time, the second passage 92a can be formed.

  In addition, according to the present embodiment, the jig 82 can be inserted substantially vertically into the mold from the opening 26a side of the pressure sensor chamber 26 to form the second passage 92a. The jig 82 can be pressed against the sensor connection terminals 70A, 70B, 70C from the upper side as well as the insertion / removal property is improved, so that the sensor connection terminals 70A, 70B, 70C of the jig 82 can be pressed. Retention is also good.

The throttle system and the sensor unit according to the present invention can be applied to any sensor unit in which sensors are integrated and a throttle system including the sensor unit.

Claims (9)

A throttle system comprising a throttle device for adjusting an intake air flow rate provided in an intake pipe connected to an internal combustion engine, and a sensor unit attached to the throttle device,
The sensor unit is
A housing constituting the sensor unit, which is attached to the throttle device;
A pressure sensor chamber that is provided in the housing and houses and holds an intake pressure sensor for detecting an intake pressure through the intake pipe;
With
The pressure sensor chamber, possess a pressure receiving area which receives the pressure in the intake pipe, and a pressure detecting area to detect by the pressure receiving area the intake pressure sensor the pressure receiving,
A partition that divides the pressure receiving region and the pressure detection region, and a communication portion that communicates the pressure receiving region and the pressure detection region,
Both the pressure receiving area and the pressure detecting area are formed at positions where the sensor unit directly faces the throttle device,
The said communication part is defined by the said partition, the said housing | casing, and the said throttle device by attaching the said sensor unit to the said throttle device, The throttle system characterized by the above-mentioned . The pressure receiving region communicates with the intake pipe by at least two pressure sampling passages;
The pressure sampling passage is provided in the throttle device, and includes an upstream passage portion located upstream of the intake pipe in the intake direction and a downstream passage portion located downstream of the intake pipe in the intake direction. The throttle system according to claim 1. 3. The throttle according to claim 1 , wherein the pressure receiving area is formed with a water reservoir for collecting water generated in the pressure receiving area at a position directly facing the throttle device of the sensor unit. system. The partition is formed in a concave shape toward the pressure receiving region side,
The throttle system according to claim 3 , wherein the water reservoir is formed by the partition wall. The throttle system according to any one of claims 1 to 4, wherein the communication portion is configured to have a size capable of regulating pulsation of fluid passing through the communication portion. The throttle system according to any one of claims 2 to 5 , wherein the pressure receiving region has a pressure receiving portion facing an opening of the pressure sampling passage. The throttle system according to any one of claims 2 to 6, wherein the upstream-side passage portion and the downstream-side passage portion are arranged non-parallel to each other. The throttle system according to any one of claims 2 to 7, wherein an inner diameter of the upstream-side passage portion is set smaller than an inner diameter of the downstream-side passage portion. In a sensor unit attached to a throttle device for adjusting an intake flow rate provided in an intake pipe connected to an internal combustion engine,
A housing constituting the sensor unit, which is attached to the throttle device;
A pressure sensor chamber that is provided in the housing and houses and holds an intake pressure sensor for detecting an intake pressure through the intake pipe;
With
The pressure sensor chamber, possess a pressure receiving area which receives the pressure in the intake pipe, and a pressure detecting area to detect by the pressure receiving area the intake pressure sensor the pressure receiving,
A partition that divides the pressure receiving region and the pressure detection region, and a communication portion that communicates the pressure receiving region and the pressure detection region,
Both the pressure receiving area and the pressure detecting area are formed at positions where the sensor unit directly faces the throttle device,
The communication unit is defined by the partition, the casing, and the throttle device by attaching the casing to the throttle device .

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